DR. ERIN A HSU M.D.
NPI 1366481509
Internal Medicine - Infectious Disease in San Francisco, CA
About Dr. Erin A Hsu M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ERIN A HSU M.D. (NPI 1366481509) is an individual infectious disease provider in San Francisco, California, licensed in California (A89312) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS and is a graduate of Jefferson Medical College Of Thomas Jefferson University (2003).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Erin A Hsu M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Erin Hsu reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94109
- Reassigned Medicare billing, California enrollment
- 213 clinicians in this Medicare group
Santa Rosa, CA 95404
- Reassigned Medicare billing, California enrollment
- 68 clinicians in this Medicare group
Johnstown, CO 80534
- Reassigned Medicare billing, California enrollment
- 49 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 7
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94115 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94115
SAN FRANCISCO, CA 94115
SAN FRANCISCO, CA 94115
SAN FRANCISCO, CA 94115
SAN FRANCISCO, CA 94115
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Erin Hsu's NPI number?
The NPI number for Erin Hsu is 1366481509. It was assigned to this individual provider in the NPPES registry on June 5, 2006.
Where is Erin Hsu located?
Erin Hsu practices at 2100 Webster Street Suite 400, San Francisco, CA 94115. The listed phone number is (415) 923-3883.
What is Erin Hsu's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Erin Hsu enrolled in Medicare?
Yes. Erin Hsu is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Erin Hsu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Erin Hsu reassigns Medicare benefits to 3 organizations: Pacific Inpatient Medical Group (San Francisco, CA), Aretaeus Telemedicine Inc. (Santa Rosa, CA) and Vibra Physicians LLC (Johnstown, CO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Erin Hsu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Erin Hsu was last updated on October 1, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Erin A Hsu, M.D. · NPI 1366481509
Infectious Disease physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since June 5, 2006.
## Identity
- **NPI:** 1366481509 (Entity type: Individual)
- **Enumerated:** June 5, 2006
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** A89312 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2100 WEBSTER STREET, SUITE 400, San Francisco, CA 94115-2378
- **Phone:** (415) 923-3883 · **Fax:** (415) 749-5705
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Pacific Inpatient Medical Group (NPI 1447447248, San Francisco, CA); Aretaeus Telemedicine Inc. (NPI 1548490261, Santa Rosa, CA); Vibra Physicians LLC (NPI 1659705424, Johnstown, CO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Jefferson Medical College Of Thomas Jefferson University, class of 2003
## Record status
- **NPPES last updated:** October 1, 2014
- **Other identifiers:** Medicare UPIN I56382
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Source: [NPI Profile](https://npiprofile.com/npi/1366481509) · Data from the CMS NPPES public registry.